Stockist & supplier ASTM A240 · ASME SA-240 · ASTM A480
Super Duplex 2507 Plates — ASTM A240 UNS S32750
Super duplex 2507 plate is a high-alloy ferritic-austenitic stainless steel plate for seawater and severe chloride service. Teshi Group stocks and supplies ASTM A240 / ASME SA-240 UNS S32750 plate and sheet, with other super duplex grades against order. Quotes are sent in 24–48 hours.
Also called: super duplex plate, 2507 plate, UNS S32750 plate, 1.4410 plate, F53 plate
What is a Super Duplex 2507 Plate?
Super duplex 2507 (UNS S32750) contains about 25% chromium, 7% nickel, 3–5% molybdenum and 0.24–0.32% nitrogen. This raises pitting resistance well above duplex 2205 and gives a minimum yield strength of 550 MPa. It is used for seawater systems, offshore topsides, firewater lines, desalination high-pressure sections and chemical plant handling chlorides at elevated temperature. Like 2205, it requires controlled welding procedures, and long exposure above about 300 °C is avoided because of embrittlement.
Key features
- Stockist and supplier — sourced from stainless mills; Teshi does not manufacture plate
- ASTM A240 / ASME SA-240 UNS S32750
- 550 MPa minimum yield
- Higher Cr, Mo and N than 2205 for seawater service
- Other super duplex grades (e.g. UNS S32760) against order
- A182 F53 / F55 flanges manufactured by Teshi
Specification
| Supply | Stockist & supplier — Teshi Group, India |
|---|---|
| Standard | ASTM A240 / ASME SA-240; general requirements ASTM A480 |
| Grades | S32750 (2507); S32760 against order |
| Product forms | Plate (3/16 in / 4.76 mm and thicker per ASTM A480), sheet and coil; other sizes supplied against order |
| Condition | Solution annealed and descaled (pickled) |
| Finish | No.1 (hot rolled, annealed, pickled) for plate; 2B, BA or No. 4 for sheet |
| Other plate grades stocked | Carbon / boiler: IS 2062 E250–E450, ASTM A36, A516 Gr 60 / 70, A537; Cr-Mo: ASTM A387 Gr 11, 12, 22, 91; stainless: ASTM A240 304 / 304L / 304H, 309S, 310S, 316 / 316L / 316H / 316Ti, 317L, 321 / 321H, 347 / 347H, 410, 430, 904L, 254 SMO; duplex S31803 / S32205; super duplex S32750 / S32760; nickel: Monel 400 (B127), Inconel 600 (B168), Inconel 625 (B443), Incoloy 800 / 800H / 800HT (B409), Incoloy 825 (B424), Hastelloy C276 / C22 (B575), Hastelloy B2 / B3 (B333), Alloy 20 (B463), Nickel 200 / 201 (B162); titanium Gr 1, 2, 5, 7, 12 (B265); Cu-Ni 90/10, 70/30 (B171) |
| Testing | Chemical and tensile tests per A240; ASTM A923 (detrimental intermetallic phase) test when specified |
| Documents | Mill test certificate to EN 10204 3.1; EN 10204 3.2 / third-party inspection when the order specifies |
Applications
- Seawater cooling and firewater systems
- Offshore topsides and subsea equipment
- Desalination high-pressure sections
- Chemical plant with hot chlorides
- Pulp and paper bleach plant
Chemical composition — super duplex 2507 (ASTM A240)
| UNS | C | Mn | P | S | Si | Cr | Ni | Mo | N | Cu |
|---|---|---|---|---|---|---|---|---|---|---|
| S32750 | 0.030 | 1.20 | 0.035 | 0.020 | 0.80 | 24.0–26.0 | 6.0–8.0 | 3.0–5.0 | 0.24–0.32 | 0.50 |
Maximum unless a range is shown; % by weight. Per ASTM A240 Table 1.
Mechanical properties
| UNS | Tensile, min (MPa) | Yield 0.2%, min (MPa) | Elongation in 50 mm, min (%) | Hardness, max |
|---|---|---|---|---|
| S32750 | 795 | 550 | 15 | 310 HBW / 32 HRC |
Per ASTM A240 Table 2.
Technical data sheets
Dimensions & weights
FAQ
Super Duplex 2507 Plate: common questions
What is the difference between duplex 2205 and super duplex 2507?
2507 has more chromium, molybdenum and nitrogen, so it resists pitting in seawater better, and its minimum yield is 550 MPa against 450 MPa for 2205.
Can super duplex be used at high temperature?
Super duplex is normally limited to below about 300 °C, because longer exposure at higher temperatures causes embrittling phases. Check the design code limit for your service.
Is UNS S32760 the same as S32750?
No. S32760 is a different super duplex grade with added tungsten and copper. Both are used for seawater; specify the exact UNS number. Many specifications permit only one.
Does Teshi manufacture super duplex plate?
No. Teshi Group is a stockist and supplier of Super Duplex 2507 Plate, sourced from established mills and supplied with the original mill test certificate. Teshi is an OEM manufacturer of flanges, fittings, fasteners, valves and custom fabrications, which can be ordered with it.
Need a size or grade not listed here?
We source against your specification from approved mills, with mill test certificates and inspection before dispatch.
Send us your specificationTraceability
From mill heat to your site
- 01
Approved mill material
Received against the mill certificate; heat number registered.
- 02
Forging & machining
Heat number carried through every stage in our Indian works.
- 03
PMI, dimensional & NDT
Every lot inspected to the governing standard; TPI witness on request.
- 04
Stamped & certified dispatch
Hard-stamped pieces with EN 10204 3.1 / 3.2 certificates.
Quick RFQ
Quote for Super Duplex 2507 Plate in 24–48 hours
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